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Möhner et al1 suggest that allowable levels of respirable quartz should be lowered. Current levels would be associated with a decline in pulmonary function parameters and an increase in chronic obstructive pulmonary disease (COPD) incidence.
We appreciate the work of Möhner et al because information about exposure-response relation of quartz and COPD is sparse. However, we believe that the study quality is insufficient for use in quantitative risk assessment:
Timing and …
Contributors All authors included on the letter fulfil the criteria of authorship. There is no one else who fulfils the criteria but has not been included as an author.
Competing interests None.
Provenance and peer review Not commissioned; internally peer reviewed.